| 摘要 |
A wavelength division multiplexer (WDM) (30) is used to transmit the output light from a superluminescent diode (SLD) (10) over a band approximately equal to the full width half maximum (FWHM) SLD bandwith and its output serves as an IFOG light source. The residual (uncoupled) spectrum contains two sidelobes, which are then separated by another WDM (40) into a lower half centered around lambda 1 And an upper half centered around lambda 2. These sidelobes are detected and fed to a differential amplifier (50) whose output is an error signal which is used in a feedback loop (52) to control the SLD drive current (14) or the drive current of a thermoelectric cooler (TEC) (12) on which the SLD (10) is mounted, both of which affect the SLD spectrum. The same results are achieved using the back output light of the SLD chip.
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